Biscationic monoazo dyes for acid modified nylons

ABSTRACT

ORANGE TO VIOLET BISCATIONIC AZO DYES HAVING THE FORMULA   ((4-(R1-N(+)(-R2)(-R3)-CH2-CO-),2-R4-PHENYL)-N=N-(W-N=N)M-   (2-R7,5-R8-1,4-PHENYLENE)-X(+)) (A(-))2   WHERE   R1=ALKYL R2=ALKYL OR HYDROXYALKYL R3=ALKYL, HYDROXYALKYL OR BENZYL OR R2 AND R3 TOGETHER=ALICYCLIC RING OR R1, R2, AND R3 TOGETHER=PYRIDINIUM RING R4=H OR C1 W=1,4-NAPHTHYLENE OR   -(2-R6,5-R5-1,4-PHENYLENE)-   R5 AND R6=H, ALKYL, ALKOXY OR C1 R7=H, ALKYL, ALKOXY, C1, NHCO ALKYL OR NHCOC6H5 R8=H,C1, ALKYL OR ALKOXY   X(+)= (1-(-),4,4-DI(ALKYL-)PIPERAZINIUM), OR   -N(-ALKYL)-CH2-CH(-Z)-(CH2)N-Y(+)   Y$=$NR9R2R3ORNHCOCH2$NR9R2R3,   WHERE   R9=R1 OR H M=0 OR 1 N=0 OR 1 Z=H WHEN N=0 AND OH WHEN N=1 AO=ANION   AND WHERE ALKYL GROUPS 1-4 CARBON ATOMS, ARE PARTICULARLY WELL SUITED FOR DYEING OF BULK CONTINUOUS FILAMENT (BCF) NYLON STYLING CARPET, AND HAVE GOOD EXHAUST AND LIGHT-FASTNESS ON ACID-MODIFIED NYLON AND EXCELLENT RESERVE ON UNMODIFIED NYLONS, AT THE PREFERRED DYEING PH RANGE OF 6-6.5. THE DYES ARE PREPARED BY COUPLING P-AMINOPHENACYLAMMONIUM OR P-(P-AMINOPHENYLAZO) PHENACYLAMMONIUM SALTS TO N, N-DISUBSTITUTED ANILINES CONTAINING A PENDANT TERTAIRY AMINE OR QUATERNARY AMMONIUM GROUP ATTACHED TO THE NITROGEN ATOM.

United States Patent ABSTRACT OF THE DISCLOSURE Orange to violet biscationic azo dyes having the formula these modified nylons vary in acid dye receptivity. Hence, when a carpet composed of three such nylons having low, medium and high amine end content (which may be termed light-, mediumand deep-dyeable nylon, respectively) is dyed with a suitable acid dye or dyes, a threetone elfect is produced. Greater versatility of shade is obtainable by using disperse dyes in addition to acid dyes. Disperse dyes are not site-dyeing (since they possess no ionic groups) and thus dye all nylon modifications of the kind described above to the same depth, irrespective of the amine-end concentration. To illustrate this point, one can visualize a tricomponent nylon carpet dyed first where R ==alkyl R =alkyl or hydroxyalkyl R =alkyl, hydroxyalkyl or benzyl or R and R together=alicyclic ring or R R and R together=pyridinium ring R =H or Cl W=1,4-naphthylene or R and R,,-=H, alkyl, alkoxy or Cl Rq=H, alkyl, alkoxy, Cl, NHCO alkyl or NHCOC H R =H, Cl, alkyl or alkoxy BACKGROUND OF THE INVENTION Multicolored bulked continuous filament (BCF) nylon styling carpeting has grown rapidly in popularity since its introduction a few years ago. Such carpeting initially contained several polyamide modifications which dififer from each other with respect to the concentration of free amine end groups in the fiber. US. 3,078,248 describes the preparation of polyamide fibers of varying amine end content. Since amine groups act as dye sites for acid dyes,

with a suitable red acid dye and then with a yellow disperse dye. The red dye will produce light, medium and deep red shades, respectively, on the three different kinds of nylon. The yellow disperse dye, however, will dye all three nylons to the same depth of shade. The resulting shades will be reddish-yellow, orange and scarlet, respectively.

With the introduction of acid-modified nylons (e.g. as in US. 3,184,436), the range of multicolored elfects obtainable on BCF nylon styling carpeting was greatly increased. Acid-modified nylons, which contain sulfonic acid groups on the polymer chain, are dyeable with cationic dyes but have little afiinity for acid dyes. Thus, a carpet containing two or three nylons of varying affinity for acid dyes and an acid-modified nylon which reserves (is not stained by) acid dyes can be dyed at will with any combination of shades, including primary colors (those colors that cannot be obtained by mixing other colors together) side by side on the same carpet. Dyeing methods have been developed so that such carpets can be dyed with acid and cationic dyes in a single dyeing operation. Thus, a red cationic dye and a blue acid dye (with a suitable dyebath additive to prevent coprecipitation of the dyes) will produce varying shades of blue on the acid-receptive nylons and a red shade on the acidm'odified cationic dye-receptive nylon.

The choice of cationic dyes for acid-modified nylon in styling carpeting depends on two main considerations, namely, a high degree of fastness (particularly to light) on the acid-modified nylon and a lack of staining on the unmodified nylons. The former consideration is self-explanatory, since the fastness requirements for carpet dyes are higher than for almost any other dye end-use; the latter consideration is important since cross-stains can have poor fastness properties and would tend to dull the shade of the acid dyes on the unmodified nylon components and minimize the color contrast between the dilferent types of fiber.

It has been found that the staining of unmodified nylon with cationic dyes depends on the pH at which the dyes are applied to the substrate. Many commercial, monocationic dyes have satisfactory non-staining characteristics on unmodified nylon at low pH (Le. 4 or below). However, at the preferred dyeing pH range for monocationic dyes of 6-6.5, staining becomes more apparent and, in most cases, tends to become unacceptable for commercial use.

SUMMARY OF THE INVENTION Nylon styling yarns containing acid-modified nylon and unmodified nylon fibers can be dyed in an aqueous dye- 3 bath at a pH of from about 6 to about 6.5 with novel orange to'violet biscationic azo dyes having the formula where R and R =H, alkyl, alkoxy or C1 R =H, alkyl, alkoxy, Cl, NHCO alkyl or NHCOC H R zH, Cl, alkyl or alkoxy and where alkyl groups contain 1-4 atoms. The dyes have excellent reserve of non-acid-modified nylon, deep dyeing characteristics on acid-modified nylon and excellent exhaust from the dyebath.

DESCRIPTION OF THE INVENTION The monoazo dyes of this invention may be prepared by conventional techniques, by diazotizing a monoquaternary diamine of the formula (where R R and R are as defined above) in aqueous hydrochloric acid at about 10 C. with sodium nitrite and coupling the resulting diazonium compound to a quaternary amine or a tertiary amine salt of the structure (where the symbols are as defined above). The coupling reaction may be carried out by dissolving the coupler in water at room temperature or below, but preferably at about -20 C., and then slowly adding the diazonium salt preparation to it, or vice versa. To increase the reaction rate, the pH of the reaction mixture may be raised to about 3-4 by adding a suitable inorganic salt or base, such as an alkali metal acetate, carbonate, bicarbonate or hydroxide. Sodium acetate and sodium hydroxide are the preferred agents.

The disazo dyes of this invention may be prepared by coupling the diazo compound, obtained as described above, to u-naphthylamine or an amine 0 he fo mula (where R and R are as defined above. Table 1 lists examples of such amines.

Table 1 aniline 0- or m-toluidene 0- or m-ethylaniline 0- or m-anisidine 0- or m-phenetidine 0- or m-chloroaniline cresidine 2,5-xylidene 2,5-dimethoxyaniline 2,5-diethoxyaniline S-chloro-o-toluidine 5-chloro-o-anisidine Coupling may be effected at room temperature or below, but preferably at 1015 C., by dissolving the amine totally or partially in aqueous acid and then slowly adding the diazonium salt preparation to the coupler preparation, or vice versa. Adjustment of the pH as described above may be carried out to increase the rate of coupling.

The monoazo amine thus obtained may be diazotized, at room temperature or below, in situ or after first isolating and redissolving or reslurrying the intermediate in aqueous hydrochloric acid. It is then coupled to the final coupler as described above.

The monoazo and disazo dyes thus prepared may be salted from solution if necessary and then isolated by filtration.

Monoand disazo dyes in which the coupler is the salt of a tertiary amine may be used in this form, or may be quaternized by any of the agents known for this purpose in the art. Common examples include alkyl chlorides, bromides and iodides, benzyl chloride, bromide and sulfate, alkyl sulfates and alkyl p-toluenesulfonates. Alkyl may contain up to four carbon atoms, but methyl and ethyl are the preferred species.

Another alternative procedure for preparing the subject dyes is by diazotizing p-arninophenacyl chloride or 4-amino-3-chlorophenacyl chloride and coupling as described above to give monoor disazo intermediates. These compounds may then be treated with a tertiary amine to give the desired products.

For economic reasons, the preferred anion is chloride. However, substitution of other anions in no way impairs the desirable properties of the subject dyes and in some cases -(i.e. for ease of isolation of the dye) may be beneficial. Various procedures are available for introducing other anions. For instance, salts such as zinc chloride, sodium iodide, sodium fluoborate, etc., may be used as salting agents to precipitate the biscationic dyes as the zinc chloride double salt, the iodide and the fluoborate, respectively. Hydrochloric acid may be replaced with sulfuric acid in the procedures described above to produce the sulfate form of the dyes. Quaternization of the coupler compounds, before or after dye formation, may be effected by any of the agents known in the art for this purpose. Thus may such anions as bromide, methosulfate and p-toluenesulfonate 'be introduced. Picrate and phosphate are two more potentially desirable anions.

The preparation of the starting monoquaternary diamines is described in US. 2,821,526. Acetanilide is reacted with chloroacetyl chloride in the presence of aluminum chloride to give p-acetamidophenacyl chloride. Reaction of this material with a suitable tertiary amine, followed by removal of the N-acetyl group by acid hydrolysis, produces the desired monoquaternary amine. Examples of such diamines are given in Table 2.

Table 2 (p-aminophenacyl)trimethylammonium chloride (p-aminophenacyl) triethylarnmonium chloride (p-aminophenacyl)tri-n-propylammoniurn chloride (p-aminophenacyl tri-n-butylamrnonium chloride (p-aminophenacyl) dimethyl (2-hydroxyethyl) ammonium chloride (p-aminophena cyl) diethyl (Z-hydroxyethyl) ammonium chloride (p-aminophenacyl ethylbis 2-hydroxyethy1) ammonium chloride (p-aminophenacyl methylbis(hydroxyisopropyl) ammonium chloride (p-aminophenacyl benzyldimethylammonium chloride (p-aminophenacyl) benzylmethyl (Z-hydroxyethyl ammonium chloride (p-aminophenacyl ethylpip eridinium chloride (p-aminophenacyl methylpyrrolidiniurn chloride (p-aminophenacyl) pyridinium chloride (4-amino-3-chlorophenacyl trimethylammonium chloride The couplers are also prepared by known techniques from N-alkylanilines or m-chloro, m-alkyl or m-alkoxy derivatives thereof, e.g. by sequential reaction with ethyleneimine, chloroacetyl chloride and a secondary or tertiary amine; by reaction with ethylene oxide, replacement of the resulting hydroxyl group with chlorine and subsequent reaction with a secondary or tertiary amine; reaction with epichlorhydrin and then a secondary or tertiary amine; reaction with epichlorhydrin, replacement of the terminal chlorine atom with a primary amine group and then sequential reaction with chloroacetyl chloride and a secondary or tertiary amine, and so on. Other useful couplers are prepared by alkylating and quaternizing N-phenylpiperazine, or the m-chloro, m-alkyl or m-alkoxy derivatives thereof, with any of the known quaternizing agents,

examples of which are given above. Examples of such couplers are given in Table 3.

The biscationic azo dyes of this invention have been found to have good exhaust and lightfastness on acidmodified BCF nylon fibers. Such polymers are described, for instance, in US. 3,184,436 and contain sulfonate groups along the polymer chain which act as dye sites for basic or cationic dyes. The instant dyes have also been found to display an almost total lack of aflinity for unmodified nylon fibers under neutral to weakly acidic conditions. In other words, at pH 6-6.5, the biscationic dyes almost completely reserve nylon fibers which do not contain sulfonate groups. This behavior dilfers from that of known monocationic orange and red dyes, which tend to stain unmodified nylon under near-neutral conditions and which display good reserve only under more acidic conditions (i.e. pH 4 or below).

The importance of these observations lies in the fact that nylon styling carpeting, which contains acid-modified and unmodified nylons, is piece-dyed most satisfactorily at pH 6-6.5. Acid and cationic dyes are applied to the carpeting from a single dyebath, which contains an additive to prevent coprecipitation of the oppositely charged dye molecules. There are several reasons why neutral to weakly acidic conditions are preferred for this dyeing procedure.

(a) Although cationic dyes generally reserve unmodified nylons more efficiently at lower pH, they do not exhaust as well from the dyebath onto acid-modified nylon.

(b) Acid dyes generally exhaust more efficiently at lower pH, but suffer a decrease in levelness on unmodified nylon and tend to stain acid-modified nylon.

(c) Styling carpet that has a jute backing undergoes increased staining of the nylon, by impurities in the jute, with increasing acidity, causing dulling of dye shade and deterioration of dye fastness properties.

At neutral to weakly acidic conditions, cationic dyes may be applied to nylon styling carpet in conjunction with neutral-dyeing acid dyes, which have satisfactory exhaust and levelness under these conditions. It has now been discovered that the biscationic dyes described hereinabove have significantly better non-staining properties on unmodified nylon at pH 6-6.5 than any known commercial orange to red cationic dye.

Although biscationic dyes have been disclosed in the patent literature for several years for use on various substrates, particularly for acid-modified acrylic fibers, biscationic dyes like those disclosed in the present invention were found to have very limited utility on acrylics (such as those disclosed in U.S. 2,837,500 and US. 2,837,501) because of low affinity and poor buildup on the substrates. Much the same thing was found to be true of acid-modified polyester (such as is disclosed in US. 3,018,272). Thus, it was totally unexpected to find that the biscationic dyes of this invention have entirely adequate buildup on acid-modified nylon, producing deep orange to violet shades thereon.

Commercial nylon styling carpet usually contains acidmodified nylon and from two to four unmodified nylons of varying acid dye receptivity which are tufted onto a backing in a random pattern to give the desired styling effects. The acid dye receptivity of the unmodified nylon fibers is a function of their amine end content, which may range from to more than 100 gram-equivalents of free amine ends per grams of polymer. Four unmodified nylon fibers in the same styling yarn may have the following amine-end content:

(1) 5-25 gram-equivalentslight-dyeable with acid dyes (2) 25-55 gram-equivalents-medium-dyeable acid dyes (3) 55-100 gram-equivalents"deep-dyeable with acid dyes (4) 100-120 gram-equivalents-"ultradeep-dyeable with acid dyes The deep-dyeing nylons (3) and (4) are disclosed in US. 3,078,248.

The carpeting can be dyed with acid and cationic dyes in the same dyebath by using as a dyeing assistant a sulfobetaine of the general structure with (cnicrnmmornongon R-CHzN-CH CHgCHgSO3 omen. o CHzCHz o H where of dye without suppressing buildup and to minimize crossstaining.

Piece dyeing is carried out at temperatures above 70 C. and preferably near the boil -100 C.). Lower temperatures cause inferior exhaust and poor contrast through cross-staining. The pH of the dyebath may be anywhere from 3 to 9, but the most favored pH range is 6-6.5, for reasons given earlier in the discussion.

The sulfobetaine dyeing assistant may be used in amounts as low as 0.05% of the weight of the fiber being dyed, but the best results are obtained with 0.2-0.3%. Amounts in excess of 0.5% of the weight of the fiber have led to an increase in cross-staining.

The dyeing procedure is advantageously preceded by a bleach scour, as described in Example 17(a), in order to obtain maximum shade brightness and contrast.

Finally, dyeing is usually followed by conventional rinse and drying steps. Conventional finishing, drying, latexing, and double backing applicationmay be performed by customary means.

The aforementioned dyeing procedure may be adapted for the continuous dyeing of styling carpet, a comparatively new technique which is referred to in Melliand Textilberichte, 48, 415-448 (April 1967). Continuous dyeing is taught as being related to piece dyeing in that it is an aqueous process, but

(a) at very low bath ratios, i.e. 5:1 instead of 30:1 to

50:1, and

(b) the rate of fixation is much faster, since temperatures near the boil are attained more quickly in a steamer than in heating up a beck. Cationic and acid or direct dyes may also be printed onto nylon styling carpeting, with excellent results.

Although the discussion has been devoted up to this point to styling carpeting, there are other areas in which BCF nylon styling yarns may be effectively used, such as upholstery and accent or throw rugs. The dyeing of these items may be carried out by the same means as that described for carpeting, using suitable equipment. Thus, carpeting is usually dyed in becks; upholstery is usually dyed in jigs; accent or throw rugs are usually dyed in paddle machines.

In order to evaluate the instant biscationic dyes for use on nylon styling yams, they were dyed singly and in the absence of any acid dyes, onto a skein of acid-modified, 1300 denier BCF nylon (such as is described in US. 3,184,436) in the presence of a skein of light-dyeable, unmodified, 3700 denier BCF nylon having an amine end content of 5-25 gram-equivalents per 10 grams of polymer. The dyeing procedure was the same as that described in Example 17 and the evaluation of crossstaining and light-fastness for some typical dyes of this invention appears in Example 20.

EXAMPLES The preparation of the dyes of this invention may be illustrated by the following examples. Parts are given by weight.

EXAMPLE 1 Coupling of (p aminophenacyl)trimethylammonium chloride (Quatamine) to [Z-(N-ethyl-m-toluidino) ethylcarbamoylmethyl]trimethylammonium chloride A solution of 22.9 parts of Quatamine in 250 parts of water and 35 parts of 10 N-hydrochloric acid was cooled to 5-10 C. and treated with 23.5 parts of 5 N- sodium nitrite solution. After stirring at this temperature for a /2 hour, excess nitrous acid was destroyed with a small quantity of sulfamic acid. The diazo preparation was added over a period of 15 minutes to a solution of 32.9 parts of the coupler in parts of water at 10-15 0., containing enough acetic acid to give the solution a pH of 5.0. As coupling proceeded, the pH Was maintained at 3.5-4.0 by intermittent addition of sodium acetate.

The reaction mixture was stirred for 2 hours at 15 C., after which the temperature was allowed to rise to room temperature. The solution was then heated to 50- 60 C. and 110 parts of sodium iodide were added in portions. Precipitation of the dye occurred.

The temperature was allowed to fall to room temperature and the reaction mass was stirred at this temperature overnight. The solids were isolated by filtration, washed with 500 parts of 10% sodium iodide and then with 500 parts of isopropanol and dried. The chromatographically pure, reddish-orange powder had an absorptivity of 42.5 liters gram" cm.- at 490 mp (in dimethylacetamide :water=4: 1).

Found (percent): C, 43.8, 43.6; H, 5.7, 5.8; Azo N, 3.9, 4.0; I, 35.2, 35.0. Calcd. for C H N O I (percent): C, 44.1; H, 5.7; Azo N, 3.8; I, 34.5.

On the basis of the above results, the structure of the dye is EXAMPLE 2 Coupling of (p-aminophenacyl)pyridinium chloride to the coupler of Example 1 In the procedure of Example 1, 22.9 parts of Quatamine were replaced by 24.9 parts of (p-aminophenacyDpyridinium chloride. The dye was salted from solution by addition of sodium fiuoroborate. An oil was formed initially which solidified on stirring the reaction mass at 45 -50 C. for minutes. After stirring overnight at room temperature, the solids were filtered, washed with 500 parts of 5% sodium fluoroborate solution and then with 500 parts of isopropanol, and dried. The chromatographically pure red solid had an absorptivity of 53.5 liters gram-- cm.- at 488 mp (in dimethylacetamide :water=4: 1

Based on the above procedure, the structure of the dye I EXAMPLE 3 Coupling of Quatamine to N-ethyl-N-(m-tolyl)-N,N'- diethyl-Z-hydroxy-1,3-propylenediamine 15.1 parts of Quatamine were diazotized in a conventional manner, essentially as described in Example 1. The diazonium salt solution was added to a suspension of 18.5 parts of coupler in parts of water adjusted to pH 5 with acetic acid and cooled to 5-10 C. The pH 70 is GEEK-0mg 2 EXAMPLE 4 Quaternization of the dye of Example 3 A mixture of 15 parts of the dye of Example 3, 17 parts of methyl iodide, 4.6 parts of potassium carbonate and 200 parts of isopropanol was heated to the reflux temperature with stirring for 6 hours. An additional 11.5 parts of methyl iodide was then added and the reaction mixture stirred at the reflux temperature for a further 4 hours. After allowing the mass to cool by stirring overnight, the product was separated by filtration, washed with isopropanol and dried. The dye had an absorptivity of 28.5 liters gramcm. cm." at 488 III/L.

Based on the above procedure, the structure of the dye is CzH5 EXAMPLE 5 Coupling of "Quatamine to [S-(N-ethyl-m-toluidino)- Z-hydroxypropyl]trimethylammonium chloride 20.4 parts of Quatamine were diazotized by the procedure described in Example 1. 72 parts of the coupler were then added at 5l0 C. and the reaction mixture stirred at this temperature for 1 hour. The temperature was then allowed to rise to 20-25 C. over a period of 2 hours. The pH of the reaction mass was adjusted to 3-4 with sodium acetate and 26 parts of sodium fluoborate wege added. The reaction mass was stirred for 2 /2 hours and the solids were isolated by filtration, washed with 250 parts of 10% sodium fluoborate and then with parts of isopropanol and finally dired. Yield: 44 parts of red needles, having an absorptivity of 53.0 liters gramcm.- at 489 mu.

Based on the above procedure, the structure of the dye 3,759,893 1 1 1 2 EXAMPLE 6 hours and then overnight at room temperature. Filtration yielded solids which were washed with 200 parts of 20% salt solution, 200 parts of 10% salt solution, 200 parts of salt solution and finally with 100 parts of isopro- Coupling of (p aminophenacyl)dimethyl(2 hydroxyethyl)ammonium chloride to the coupler of Example 3 DiaZOtiZatiOn of Parts (P' P Y panol. After being dried, the red powder was found to y y hyl) i m Chloflde Was Carried have an absorptivity of 68.5 liters gram cm:- at 488 out essentially as described in Example 1. mg, The structure of the intermediate is:

To the diazonium salt solution was added 17.2 parts OCH: of the pure coupler of Example 3 over a 15-20 minute 63 period. The reaction mixture was stirred at 15 C. CHNCH for 2 hours and then allowed to warm to room temperal0 M a O 2 ture. After stirring for a further 2 hours, 30% sodium 019 CH3 hydroxide solution was added to raise the pH to 4 and the o o b) The second part of the diazo preparation was temperature raised to 50 55 C. Addition of 25 parts of sodium fluoroborate caused the dye to precipitate as an treated with 15.2 parts of 2,5-dimethoxyaniline, essentially l5 as described in (a) above. The resulting brown powder 011, which crystallized on stirring the reaction mass overnight at room temperature had an absorptivity of 62.5 liters gram cm.- at 490 The solids were isolated by filtration, restirred in 100 f l t t f th t t parts of 20% sodium fluoroborate solution, reisolated, es we ureo em erme 1a washed with 10% sodium fluoroborate solution and dried. CH: The chromatographically pure orange powder had an absorptivity of 44.4 liters gramcm." at 438 m (CH*(3NCH1C0@-N=N z Based on the above procedure the structure of the dye is C19 OCH3 CH3 C2135 HO CH CHzN-CHzC O -N=N -N H 213134 CH: I cH,(|1HCH,g o H.-,

EXAMPLE 7 (c) The third portion of the diazo preparation was Coupling of (p-aminophenacyl)pyridinium chloride to g ,P'fi 12 fia of i g g g;

NL hen LNNdimeth 1 i erazinium iodide a ove. e resu ing orange pow er a an a sorp 1V1 y y p of 70.3 liters gramcm.- at 454 m The structure of A solution of 7 parts of (p-aminophenacyl)pyridinium thg intermediate is chloride in 75 parts of Water and 7 parts of 10 N-hydroa) chloric acid were treated with 7.3 parts of 5 N-sodium ni- 0 O trite at 0-5 C. After stirring the reaction mixture for a. d /2 hour, excess nitrous acid was destroyed with sulfamic 019 acid. The diazo preparation was added to a mixture of 40 9.2 parts of the coupler and 100 parts of water, the mix- EXAMPLE 9 ture being first adjusted to pH 4 with acetic acid and cooled to 510 C. Sodium acetate was added during the coupling reaction to maintain the pH of the reaction mixture at 44.5. The mixture was stirred for 1 /2 hours at Coupling of the monoazo intermediates of Example 7 to N,N-diethyl-N-ethyl-N-(m-tolyDethylenediamine 45 (a) Diazotization of 16.5 parts of the intermediate ca. 10 C. and then overnight at room temperature. The from Example 7(a) was effected in aqueous hydrochloric solids were isolated by filtration and washed with 20 parts acid at 1015 C., using a molar excess of sodium of water and then 50 parts of isopropanol. The dark nitrite. After 1 /2 hours, excess nitrous acid was destroyed brown dye was slurried in 50 parts of isopropanol, iso- With sulfamic acid. lated by filtration, washed with isopropanol and dried. The 50 Coupling was effected by addition of 9.2 parts of the chromatographically pure tinctorially weak dye had a pure coupler to the diazonium salt solution at 1015 shoulder at 360 III/.0, where the absorptivity was 19.6 C. The reaction mixture was stirred at this temperature liters gramcmr' for 3 hours and then at room temperature overnight.

Based on the above procedure of the dye is The pH of the reaction mass was then adjusted to 5.0 0 N CHzCO@N=N N' 0113] 2A (whereAis Cl and/or 1 with caustic soda solution. 11.5 parts of sodium EXAMPLE 8 iodide were added and the mass was heated to 40 -45 0 C. and then stirred at room temperature overnight. Coupling of Quatamine to (a) cresidine; (b) 2, Filtration yielded solids which were reslurried in 200 dimethoxyaniline; (c) m-toluidine W parts of 1% sodium iodide solution. The dye was reiso- Diazotization of 68.5 parts of Quatamine wascarl by f Washed With Parts of Sodium ried out as in Example 1. The resulting solution of the lodlde, mslurrled 111 50 Parts of p p feisolatfid, diazonium salt was divided into three equal parts. Washed with 50 Parts of isopropanol and dried- The r d- (a) To the first part was added a partial solution of brown Powder had an absorptivity of liters granfl 13.6 parts of cresidine in 50 parts of water containing f 311525 enough acetic acid to dissolve about half of the cresidine. Based on the above procedure, the dye has the struc- The reaction mixture was stirred at 10-15 C. for 4 ture:

CgHs (CW...O NZN N=N N e CH3 CIHS z i I 02115) 2 13 14 (b) Diazotization and coupling of 17.2 parts of the C, 51.1; H, 5.9; Cl, 23.3; N, 9.2. Found (percent): C, monoazo intermediate of Example 7(b) was performed 21-5,

f (4-acetyls entlall as described in a above, 1eld1ng a dark, P o Chloroquatamme 11 1 Parts Z wder havin )absorptivgy of 60 5 liters ammo 3 chlorophenacyl)trlmethylammonlum chloride f cm f 563 m g 5 were heated in 90 parts of water and 81 parts of congr r ,u..

centrated hydrochloric acid at reflux. The aqueous reac- Based on the above Procedure: the Structure of the dye tion solution had 5.12% diazotizable compound by weight 153 (-100% yield).

OCH: 6 /C2Hs (omuNomoo-@-N=N N=N@N\ GB 219 CH: a 021541? 02115) 3 H (c) The procedure of Example 8(a), using the mono- EXAMPLE 12 azo intermediate of Example 7 (c), produced a dye hav- Coupling of o-chloroquatamme to [Z-(N-ethyl- 1 1 $5 an absorptivity of hters gram at 523 anilino).ethyl]trimethylammonium chloride Based on the above procedure, the structure of the dye Diazotization of 13.2 parts of o-chloroquatamine was is: efiected by a conventional procedure. The diazo solution C2115 ea (oizmmomo o-@ N=N-@-N=N- --N 9 ee 21 C2 r 2H5)2 CH3 E3 H EXAMPLE 10 was added to a solution of 12.5 parts of the coupler Quatemizafion of the dye of Example 8(6) in 60 parts of water at 5 -10 C. The pH was ad usted to 4-4.5 with sodium acetate, as required. After stirring Quatermzation of 10 parts of the dye of Example 8(0) for /2 hour, the temperature was allowed to rise and the with 21.5 parts of methyl iodide, using the procedure of reaction mixture was stirred at room temperature for Example 4, produced a dark reddish-brown powder ha 1 hour. It was then warmed to C. and 25 parts of ing an absorptivity of 43.3 liters gram" cm. at 510 sodium fluoroborate were slowly added. Precipitation of m Based on the above procedure, the structure of the the dye started immediately.

dye is: After stirring overnight, the solids were isolated by C3H5 G9 (CH3)sNCHaCO-@-N=N-@N=N-N e 2Hr 2 5)2 H i CH3 EXAMPLE 11 filtration, washed with 5% sodium. fluoroborate solution, then with isoprop-anol, and dried. The dye had an abfigzg g q fig gg ifgfgfiflfigfiiggggflf sorptivity of 52.1 liters gram cm." at 478 m Found r (percent): C, 46.5, 46.4; H, 5.8, 5.8; N, 11.0, 11.0; Azo m-Chloro-p-acetylammophenacyl chloride-A N, 4.6, 4.6. Calcd for c ,H ,B c1F N,o (percent): 0, lution of 18.75 parts of p-acetylamlnophenacyl chloride 46.6; H, 5.9; N, 11.4; Azo N, 4.5.

in 140 parts of acetic acid and 32.5 parts of concen- Th t ctur of th dye is;

01 a; 0 H; 6 (CHa)3NCH;CO- G N=N@-N/ 6B C2H4N(CHa)3 trated hydrochloric acid was cooled to 0-5 C. A solution EXAMPLE 13 of 4.4 parts of sodium chlorate in 10 parts of water was added dropwise and allowed to react at room tempera- Couphng of 0 chloroquatamme to [2 (N ture for three hours. The product was isolated by filtration toluidino)ethyl]diethylmethylammonium methosulfate and washed with bisulfite solution and then with Water. Diazotization of 13.2 parts of o-chloroquatamine and It was then recrystallized from an acetone-water mixture coupling to 18.9 parts of coupler were carried out essento yield 9.7 parts of product, M.P. 182-184"; IR (Nujol) tially as described in Example 11. The dye had an ab- 3400 (NH) and 1690 cn'1.- (C=O). sorptivity of 47.5 liters gram cm." at 490 mu. Found Analysis.-Calcd for C H Cl NO (246) (percent): (percent): C, 48.1, 48.0; H, 6.1, 6.1; N, 10.4, 10.3; Azo C, 48.8; H, 3.7; Cl, 28.7; N, 5.7. Found (percent): C, N, 4.4, 4.3. Calcd for C H B C'lF N O (percent): C, 49.1, 49.3; H, 3.9, 4.0; Cl, 28.3, 28.4; N, 5.8, 5.8. 49.5; H, 6.4; N, 10.7; Azo N, 4.3. The dye has the struc- (b) (4-acetylamino 3 chlorophenacyl)trimethylamture:

G1 G9 /CH5 ahNCI-hC O N=N@N\ Ga 2B F 4 z 4 2 5)z CH3 CH3 monium chloride.-9.7 parts of m-chloro-p-acetylamino- EXAMPLE 114 phenacyl chloride was added to 225 parts of acetone and reacted with excess trimethyl amine. Product was re- Coup gi gfi ;?g g g? fi ggg g gg covered by filtration to yield 11.6 parts, M.P. 212-214 y y y P py C.; IR (Nujol) 3300 (NH) and 1670 cm. (C=O). Diazotiazation of 13.2 parts of o-chloroquatamine Analysisr calcd for C H CI N O GOS) (percent): and coupling to 13.7 parts of coupler was carried out essentially as described in Example 11, except that acetic y filtration and f Yield: P T y had an absorptivity of 30.9 liters gramcm. at 545 III/L- ac1d was also added to dissolve the coupler prior to addi- Based on the above procedure the Structure-of, the dye tion of the diazo compound. The dye was salted from is solution with sodium chloride. The dye had an absorp- (b) The procedure described in (a) above was retivity of 58.2 liters gram cm. at 513 m Found (perpeated, except that N-ethyl-N-phenyl-N,N'-diethylethylcent): C, 52.3, 52.6; H, 6.9, 6.9; N, 11.1, 11.2; Azo N, enediamine was replaced with an equivalent amount of 4.8, 5.0. Calcd for C H CI N O (percent): C, 55.7; H, N ethyl N-(m-tolyl)-N,N'-diethylethylened1amine. The

7.1; N, 12.5; Azo N, 5.0. The dye has the structure: product was precipitated from solution with sodium chlo- 0,11 o (CHmNCHaCO @N=N@N\ a 201 CHg(|3HCHzN(C2H5)2 OH H EXAMPLE ride, isolated by filtration, reslurried in 100 parts of water coupling of Quatamine to [2 (N ethy1 m tO1uidin0) for 1 hour and relsolated by filtration. The solids were washed in turn with 10%, 5% and then 1% sodium chloethyl]dlethylmethylammomum methosulfate ride solution and dried. Yield: 14.5 parts. The dye had When 13.2 parts of o-chloroquatamine were replaced an absorptivity of 59.9 liters grarncm.- at 570 m by 11.4 parts of Quatamine in the procedure of Ex- Based on the above procedure, the structure of the dye is ample 12, a dye was obtained which was salted out of solution with sodium iodide, isolated by filtration, washed EXAMPLE 17 with water and dried. The reddish-orange powder had an absorptivity of 45.6 liters gram cm? at 469 me. Dyemg of banded BCF nylon carpeting Based on the above procedure, the dye has the structure: (a) Bleach scour.-100 parts of the carpeting described 02H. (CH3)3NCH:CO@N=N N CH; The following examples illustrate the dyeing methods above were heated for 5 minutes at 80 F. in 4000 parts of for banded test carpet prepared as described in col. 7, lines water containing 7 -69. In order to demonstrate the reserve of the bis- 45 Parts cati nic dyes on unmodified nylon, they were dyed in the Sodium perborate 4 a s nce of acid dyes onto the banded nylon carpeting. The Trisodium phosphate 0.25 carpetlng contained acid-modified, medium-dyeable and A sulfobetaine ultra-deep-dyeable BCF nylon fibers tufted in a random e (311,011,011

atter o a l p n 11 non woven po ypropylene backing. 0'9

EXAMPLE 16 CHICHOH Preparation of two dyes from p-(4-aminonaphthylazo) he e h P enacylarnmonium chloride R: 16 alkyl (-30% A mixture of 41.9 parts of p-(4-aminonaphthylazo) C alkyl (-30 phenacylammonium chloride, 300 parts of water, 50 parts C t t d (-40%) of acetic acid and 11.6 parts of 10 N-hydrochloric acid a was cooled to 20 C. and 34.2 parts of 5 N-sodium nitrite The temperature was ralsed to 160 for 15 mmutes 00? F. were slowly added. After stlrring for 30 mlnutes at 20 and the carpet nnsedm water an excess nitrite was destroyed with a small quantity of (b) Dyemg procedure The carpetmg was added. to

sulfamic acid. The diazonium salt solution was cooled 4O0o'parts of water contammg P t to 15 C. and divided into two equal parts.

(a) To one half of the diazo solution was added a The aforemnuoned sulfobetame."7 "'2' solution of IL 4 parts of The tetrasodrum salt of ethylenediamme tetraacetrc 25 ethylenediamine in 25 parts of water and 10 parts of and 6 acetic acid. After stirring at 15 C. for 2 hours, the re- Tetrasodlum Pyrophosphate action mixture was allowed to warm up to room tem- The dyebath was adjusted to pH 6 with monosodium perature over a 1-hour period. The pH was adjusted to phosphate and the temperature raised to 80 F. for 10 3.2i0.5 with sodium acetate and the mass was heated minutes. 0.05 part of the dye of Example 1 was added and, to 40-45 C. with stirring. A solution of 10.8 parts of after holding the dyebath at F. for 10 minutes, the sodium iodide in parts of water was added and the temperature was raised at ca. 2 F. per minute to 210 mixture stirred overnight. The mother-liquor was then P. and held at this temperature for 1 hour. The carpeting decanted and the oily dye was triturated in 250 parts of was rinsed in cold water and dried. The acid-modified 1% sodium iodide solution. The resulting slurry was then band was dyed a scarlet shade. The unmodified fibers had heated at 30-40 C. for 1 hour and the solids isolated 75 a negligible stain.

1 7 EXAMPLE 18 Printing of BCF nylon styling carpeting A sample of BCF nylon styling carpeting was printed with a mixture containing The cationic dye of Example 3 5 parts. The sulfobetaine described in Example 15 05 part. Glacial acetic acid 5 parts. Carrageenin thickener To give the desired viscosity. Water To 100 parts.

The carpeting was steamed at 212-220 F. for 10 minutes, rinsed, scoured for 15 minutes at 160 F. in a 0.03% aqueous solution of the condensation product of 20 moles of ethylene oxide with 1 mole of C alcohol, rinsed and dried. The acid-modified nylon fibers were dyed a scarlet shade. The unmodified fibers had a negligible stain.

EXAMPLE 19 Continuous dyeing of nylon styling carpeting Using Kusters equipment as described in Textile Chemist and Colorist, Jan. 14, 1970, pp. 6-12, nylon styling carpeting as described in Example 15 above was run through a wet-out bath at 80 F. containing Monosodium phosphate to adjust the pH to ca. '5.

The dyebath temperature was 80 F. Pickup was about 200%. The carpeting was then run through a steamer at 212 F., in which the dwell time was 8 minutes. The carpeting was rinsed thoroughly and dried. The acidmodified nylon fibers were dyed an orange shade; the unmodified fibers were negligibly stained.

EXAMPLE 20 Evaluation of cross-staining and light-fastness The' dyes of Examples 1-6, 8, 9 and 11-14 were applied to skeins of acid-modified BCF nylon in the presence of skeins of light-dyeable unmodified BCF nylon, by the dyeing procedure described in Example 15. For comparison, a commercially available monocationic dye was used, having the structure 6 (mm 011,0 0 @-N=N@ The results appear in Table 4. In each case, the shade depth on me acid-modified skein was adjusted to be visually equal to that of the monocationic dye at 0.5% (on the weight of the fiber).

Ratings of staining and light-fastness were made according to the Gray Scale, as given in the Manual of the American Association of Textile Chemists and Colorists. The numbers have the following significance:

=negligible or no change (or stain) 4=slight change (or stain) 3=noticeable change (or stain) 2=considerab1e change (or stain) 1=much change (or stain) W=weak TABLE 4 Light-fastness onac Stain on modified nylon, unmodified hours Xenon llght-dyeable Are Fade- Shade nylon Ometer Commercial dye Red- 3-2 5-4W Example:

1 RecL 5-4 2 Orange 4-3 3- Scarlet. 5 5-4W 4. .do 5 5-4W 5 -.do 5 5-4W 6 Orange 4-3 7. Yellow 5-4 9(a) Maroon 4 9(a) Violet 5 9(0)--- Maroon 5-4 4-3W 10 do 54 4W 12.- Orange 5-4 54W 13.- Scarlet- 5-4 5-4W 14.- Maroon 5-4 5-4W 15 Orange..- 5 MW 16(a) Violet 4 3-2Y, W 16(b) Blue-violet 4 4W, 3R

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Biscationic monoazo dyes having the formula:

where R =alkyl R =alkyl or hydroxyalkyl R =alkyl, hydroxyalkyl or benzyl or R and R together=alicylic ring R =H or Cl R =H, alkyl, alkoxy, Cl, NHCO alkyl or NHCOC H Rg=H, Cl, alkyl or alkoxy alkyl re as Y =NRuR2RI 0|. NHCOCH NRpRzR where R =R or H =0 or 1 Z=H when w=0 and OH when n=1 A- =anion and where alkyl groups contain Il-4 carbon atoms.

2. The biscationic monoazo dye of claim 1 in which 1'= s, 2= m s= a 4= 7= 3, R =H, and

02115 e; X=-N CI-IqCH CliaNWlb):

References Cited UNITED STATES PATENTS 2,821,526 l/l958 Boyd, Ir. 260-205 3,532,683 10/1970 Sartori 260-2074 X FOREIGN PATENTS 17,484 9/1963 Japan 260-2075 LEWIS GO'ITS, Primary Examiner C. F. WARREN, Assistant Examiner U.S. Cl. X.R.

260--146 R ,146 D, 148, 152, 154, 156, 184, 185, 186, 187, 191, 205, 206, 207, 207.1; 8-41 B, 42 B $222530 I I I UNITED STATES PATENT OFFICE,

CERTIFICATE OF CORRECTION Patent No. 3 ,759,893 bated Sept. 18, 197

Inventofls) Daniel Shaw Jamee It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

e At col. 18, line no, "X should be inserted before the formula so as to read I Signed and sealed this 25th day of Decembei" 1973.

(SEAL) Attest:

EDWARD. M.FLETQI ER,JR. I RENE D. TEGTMEYER Attestlng Off cer Acting Commissioner of Patents 7 

